Breeder reactors
a. produce plutonium from 238U.
b. use 238U as a fuel.
c. produce 235U from 238U.
d. produce 238U from 235U.
a
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Why is the solar nebula theory considered a theory rather than a hypothesis?
a. It has extensive evidence and explains many observations of different objects. b. It solves the angular momentum problem, which is the main problem of Solar System formation research. c. It is based on mathematical models and previous calculations of molecular and particle properties. d. It is accepted by most scientists nowadays, and it is conventionally named as a theory
The _______________ of the moon is the period of time for the moon to complete a cycle of the lunar phases and is approximately 29.5 days long
a. sidereal period b. saros cycle c. synodic period d. eclipse season e. umbral period
If you were on the Moon during a total lunar eclipse, the Sun would be hidden behind Earth
a. True b. False Indicate whether the statement is true or false
A block is at rest on a wooden ramp. The coefficient of static friction between the block and ramp is 0.35. What is the angle between the ramp and the horizontal direction when the box first begins to slide?
A. 17
B. 19
C. 29
D. 20
E. 22